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김제춘,장승필,Kim, Je Choon,Chang, Sung Pil 한국강구조학회 2002 韓國鋼構造學會 論文集 Vol.10 No.4
사장교의 정확한 초기형상을 결정하기 위한 초기평형상태 해석법으로 케이블 장력에 큰 영향을 미치는 축방향 변형을 고려한 반복해석 알고리즘을 제시하였다. 해석의 정확성과 수렴성을 향상시키기 위해 매개변수 해석을 통해 케이블 장력의 초기값을 간단하게 결정할 수 있는 방법을 제안하였으며, 3차원 뼈대요속와 탄성현수선요소를 적용한 해석 프로그램을개발하여 사장교의 기하비선형 거동을 고려하였다. 실교량 모델을 포함한 해석 예제를 통하여 본 연구에서 제시한 해석 알고리즘의 정확성과 적용성을 검증하였다. 제안된 해석 알고리즘은 부재 제작시 측방향 변형을 제작 캠버량으로 반영하지 않는 경우나 시공중 발생하는 시공오차나 제작오차의 영향을 제거하기 위해 최종장력을 보정하는 경우에 유용하게 적용될 수 있다. The study proposed the initial equilibrium state analysis method that considers axial deformation, in order to accurately determine the initial shape of a cable-stayed bridge. Sepecifically, the proposed method adopted the successive iteration method. In order to evaluate appropriate initial cable force introduced in the initial equilibrium state analysis, parametric studies were performed and a useful linear analysis method proposed. The geometrically nonlinear static behaviors of cable-stayed bridges were considered, using three-dimensional frame element and elastic catenary cable element. The usefulness and applicability of the analytic method proposed in this study were demonstrated using numerical examples, including a real cable-stayed bridge. The algorithm, is applicable in cases wherein axial deformation is not adopted in the fabrication camber, or final cable force is adjusted to eliminate construction and fabrication errors occurring during construction.
장승필(Sung Pil Chang),조서경(Seo Kyung Cho),김제춘(Je Choon Kim),변형균(Hyung Kyun Byun) 한국강구조학회 1994 韓國鋼構造學會誌 Vol.6 No.2
This paper presents a construction error control system to improve the construction accuracy of composite cable stayed bridges constructed by the free cantilever method. In cantilever method structural system changes according to the progress in construction. Then errors may be accumulated and amplified through complicated construction steps. Even if the section dimensions are controlled within the specification allowance limit, cable force and girder deflection will have errors far exceeding the allowance limits. Although the design is accurate and correct construction is done, a certain amount of errors in cable tension and geometry is inevitable. Thus, the feedback process of measurement and adjustment is required for more accurate construction. The error control system consists of the processes of measurement, construction stage analysis, error factor estimation, prediction and optimum adjustment. In the analysis system composite action of concrete slab and steel girder evaluated by the proposed stiffness matrix. Output results are accumulated for each load increment. Also, various construction commands are defined to simulate complicated construction procedure. The optimum adjustment system can reduce overall errors evenly to avoid undesirable distortion and overstress. The optimum adjustment system can reduce overall errors evenly to avoid undesirable distortion and overstress. The error factor estimation and prediction system can calculate the quantitive value of error factors and show behavior of structures at later steps. Adjustments can be possible based on final step information. The proposed system can provide tools for adjustment and cable adjustment base applications.
장승필(Sung Pil Chang),조경식(Kyung Sik Cho),김제춘(Je Choon Kim) 한국강구조학회 1993 韓國鋼構造學會誌 Vol.5 No.2
In this study, the geometric nonlinear analysis of the cable-stayed bridge which has composite sections is presented. Considering the time-dependent effects due to the creep and shrinkage of concrete, the linear and nonlinear static analysis of bridge which has the changing structural system according to the construction step is performed. The construction command is defined for every construction step and the nonlinear analysis is carried out in each load step according to the construction command. In composite section the force is distributed to girder and slab by the sectional property and the compatibility. If girder and slab satisfy the nodal displacement and compatibility conditions in a composite section, these two members which is interacted completely can be regarded as one element. And the resultant force of composite section is redistributed to girder and slab by the sectional property and the compatibility after each construction step analysis.